CentOS Stream 9
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Squid : Configure Reverse Proxy2022/03/22

Configure Squid as a Reverse Proxy Server.
[2] Configure Squid.
[root@dlp ~]#
vi /etc/squid/squid.conf
# line 55 : add (allow all http access)

http_access allow all

# And finally deny all other access to this proxy
http_access deny all
# line 60 : specify the backend Web server

http_port 3128
http_port 80 accel defaultsite=node01.srv.world
https_port 443 accel defaultsite=node01.srv.world cert=/etc/letsencrypt/live/dlp.srv.world/fullchain.pem key=/etc/letsencrypt/live/dlp.srv.world/privkey.pem
# line 64 : uncomment
# number means ⇒ [disk cache size] [number of directories on top level] [number of directories on 2nd level]

cache_dir ufs /var/spool/squid 100 16 256
# add to the end

cache_peer node01.srv.world parent 80 0 no-query originserver
# memory cache size

cache_mem 256 MB
# define hostname

visible_hostname dlp.srv.world
[root@dlp ~]#
systemctl enable --now squid

[3] If Firewalld is running, allow HTTP/HTTPS services.
[root@dlp ~]#
firewall-cmd --add-service={http,https}

[root@dlp ~]#
firewall-cmd --runtime-to-permanent

[4] Change settings of DNS or Routers in your local network if need to listen HTTP/HTTPS access on Squid, then try to access to Squid Reverse Proxy Server from a Client Computer with Web browser.
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